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1. Working alone, pump A can empty a pool in 3 hours. Working alone, pump B can empty the same pool in 2 hours. Working together, how many minutes will it take pump A and pump B to empty the pool?

  • A. 72
  • B. 72
  • C. 72
  • D. 72

Answer: Option A

Explanation:

In 1 hour A can empty13 part"  1   "    B    "     "       12 "  Together=13×12=56partSo, 56part in 1 hour1     "   "   65 "= 65×60min=72 min

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